Grain boundary segregation induced strengthening of an ultrafine-grained austenitic stainless steel

被引：118
作者：
Abramova, M. M. [1 ]
Enikeev, N. A. [1 ,2 ]
Valiev, R. Z. [1 ,2 ]
Etienne, A. [3 ,4 ]
Radiguet, B. [3 ,4 ]
Ivanisenko, Y. [5 ]
Sauvage, X. [3 ,4 ]
机构：
[1] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia
[2] St Petersburg State Univ, St Petersburg 198504, Russia
[3] Univ Rouen, CNRS, UMR 6634, Grp Phys Mat, F-76801 St Etienne Du Rouvray, France
[4] INSA Rouen, F-76801 St Etienne Du Rouvray, France
[5] Karlsruhe Inst Technol, Inst Nanotechnol, D-76344 Eggenstein Leopoldshafen, Germany
来源：
MATERIALS LETTERS | 2014年 / 136卷
关键词：
Nanostructured materials; Austenitic stainless steel; High pressure torsion; Strength; Grain boundary segregation; DISLOCATION; EVOLUTION; BEHAVIOR;
D O I：
10.1016/j.matlet.2014.07.188
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of grain boundary segregation on the strength of a nanostructured austenitic stainless steel was investigated. The steel was nanostructured by severe plastic deformation at two different temperatures to form ultrafine-grained states different by microstructure parameters. It is shown that despite the difference in grain size both nanostructured steels demonstrated the same level of strength. For the first time it is directly observed that severe plastic deformation at elevated temperature leads to formation of MO-Cr-Si rich grain boundary segregations in the steel. Considering different contributions to the material strengthening, we demonstrate that grain boundary segregations can lead to significant enhancement of the yield stress. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：349 / 352
页数：4
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